Not me personally but I've known a few people and heard tales. I've had a few friends work in the local mental hospital and told stories about cutting people down etc. My sons dad was sectioned once and used to tell me about saving a girls life that had attempted.
The most gruesome stories came from my dad though, he used to be in mountain rescue and unlike its name they don't only attend rescues up mountains, it could be anywhere if an ambulance wasn't available they would attend, a lot were people who had gone missing after threatening to ctb and it was just unfortunate luck who found them. A lot of the time my dad found them.
I preach that you shouldn't ctb if it will effect another as in jumping in front of a train etc but I've learnt that if someone finds you already dead it doesn't effect them as much because they weren't there at the time.